11 mm Dovetail to 20 mm Picatinny Rail Adapter – 9 Slot

Many air rifles, rimfire rifles and lightweight sporting firearms come factory-fitted with an 11 mm dovetail rail. This standard has served the shooting world for decades and holds dedicated mounts reliably – but as soon as you want to fit a Picatinny or Weaver optic, red dot or thermal clip-on, you reach an impasse. This adapter removes that barrier: it converts the rail to the modern tactical standard without any modification to the firearm itself.

Construction and Material

The adapter is CNC-machined from aerospace-grade aluminium. Parallel surfaces and precise slot spacing are not incidental details: they are the tolerances that determine whether your optic stays on zero after recoil or shifts. The hard-anodised matte black finish is wear-resistant and non-reflective – both practical advantages in the field.

• Material — aerospace-grade aluminium
• Finish — hard anodising, matte black
• Machining — CNC, parallel surfaces, standard slot pitch

Retention and Stability

The adapter clamps onto the firearm's 11 mm dovetail rail with two high-strength hex screws that apply even clamping force across the contact surface. The built-in recoil stop pin resists movement under both rearward and forward loading, so the optic stays exactly where you zeroed it.

• Clamping — 2 × high-strength hex screws
• Stop pin — bidirectional recoil-resistant, zero-holding design
• Base rail — 11 mm dovetail

Compatibility

The top surface fully conforms to the Picatinny / Weaver MIL-STD-1913 standard, accepting any mount, scope ring, red dot or accessory built to that specification. The 9-slot, 100 mm layout gives enough fore-and-aft travel to set the optic at the correct eye relief – particularly important with higher-magnification riflescopes.

• Top rail — 20 mm Picatinny / Weaver, MIL-STD-1913
• Slots — 9
• Compatible accessories — scope mounts, rings, red dots, clip-on devices and accessories

Specifications

• Length — 100 mm
• Clamping length — 75 mm
• Height (rise) — approx. 21 mm
• Width — 25 mm (including clamping screws)
• Material — aerospace aluminium
• Finish — hard anodising, matte black
• Slots — 9
• Base rail — 11 mm dovetail
• Top rail — 20 mm Picatinny / Weaver (MIL-STD-1913)
• Weight — 62 g

Box Contents

• 1 × 11 mm to 20 mm Picatinny rail adapter (9 slot)
• 1 × hex key

Who Is This For?

This adapter is the practical choice for air rifle and .22 LR shooters, as well as owners of small-calibre sporting firearms, who want to run Picatinny-standard optics or accessories on a factory 11 mm dovetail rail. It is especially useful when fine eye relief adjustment is needed and a simple slide adapter does not provide enough travel. Not recommended for high-recoil, large-calibre firearms.